Nuts

• When eaten in moderation -- a few ounces at a time -- nuts are a nutritional snack that can provide a major energy boost when you're feeling sluggish. You can find a wide variety of seasoned nuts in the snack aisle at any grocery store or make your own if you prefer to control the ingredients that go into your snacks. Purchase your choice of raw nuts, such as almonds, walnuts or pistachios, add your choice of seasonings, such as sea salt or a cinnamon and sugar blend, and roast them. A vacuum-sealed package of nuts can last for up to 2 years unopened or up to 18 months in an opened package.

Dehydrated Fruit

• Fresh fruit doesn't have a particularly long shelf life, but if you remove the moisture from the fruit you increase the shelf life dramatically while retaining most of the nutritional benefits. One of the easiest ways to dry fruit is with a dehydrator. Dehydrators have several stackable racks that allow air circulation; they distribute low heat to slowly draw out the moisture. Alternatively, you can use your oven's lowest setting to dehydrate fruit at home. While using fresh fruit is always best for dehydrating, you can use drained canned fruits to save on preparation time.

Granola

• Reach for a handful of granola when you're looking for a quick snack to tide you over between meals. Granola can contain any number of healthy ingredients to fill you up and keep you satisfied. Rolled oats are a staple ingredient in granola, but you can customize your granola blend with any number of ingredients, such as flaxseeds, chia seeds, chopped nuts and chopped, dried fruit sweetened with honey. If you prefer granola in convenient bar form, use extra honey or agave nectar to bind the ingredients and press them onto a flat pan to bake. Granola can keep for several months inside an air-tight container, and has an even longer shelf life if vacuum-sealed.

Crackers

• Crackers can be eaten plain as a snack on their own or as part of a snack along with more perishable foods such as cheese and dip. Healthy artisan crackers can quickly increase your grocery bill, so mix your own ingredients and bake crackers at home. A basic cracker recipe calls for flour, water, salt and baking powder to raise them slightly. You can season the crackers with practically anything, such as olive oil, Parmesan cheese, rosemary, garlic, sea salt or black pepper. Alternatively, you can purchase pita bread, cut them into chip or cracker shapes, season to taste, and bake until golden and crisp. Your homemade crackers or crisps can be stored for a month or more in air-tight containers, depending on the ingredients added.